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Xandarodinium xanthum
From Fensome et al., 2019:
Xandarodinium xanthum Reid, 1977, p.447–448, pl.3, figs.27–29.
Holotype: Reid, 1977, pl.3, figs.27–28; Fensome et al., 1995, figs.1–2 — p.1921.
Motile equivalent: Protoperidinium divaricatum (Meunier, 1919) Parke and Dodge, 1976, according to Matsuoka (1984b, p.2) — however, see Head (1996b, p.1213).
Stratum typicum: Recent
Locus typicus: Dee Estuary, North Sea, England
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Original description: Reid, 1977, p. 447-448
Diagnosis: A species of Xandarodinium with a concave ventral area and convex dorsal area. Wall thin with a smooth surface. Processes have elliptical circular or elongate bases in plan view; from as extensions from the wall, and are terminated by simple spines or multifurcate extensions. Ventral surface and anterior dorsal surface, smooth and not ornamented by processes.
Dimensions: Holotype, test 56x56 µm, process height 6 µm. Range, test, 46x46-48x63 µm, process height, 5-19 µm. 15 specimens measured.
Description (annotated): The processes ornamenting the cyst may be simple, circular or complex flanges with multifurcate tips. Dorsal processes are intratabular, aligned equatorially reflecting the cingulum and intercalary plates. A small process complex is found at the anterior end of the ventral area and the apical plates are reflected by three processes. A complex of processes is found on two low antapical bosses with a shallow depression connecting them. Processes are not found on the operculum of the archeopyle. The cyst has a characteristical pale yellow-brown colour and was seen in certain specimens to contain a thin hyaline layer.
Affinities:
Reid, 1977, p. 447
This species is similar to the illustration of the cyst of Protoperidinium minutum (Kofoid) Loeblich by Wall and Dale (1968). It differs in having a smooth and not corrugated surface, and in not being spherical.
Xandarodinium xanthum Reid, 1977, p.447–448, pl.3, figs.27–29.
Holotype: Reid, 1977, pl.3, figs.27–28; Fensome et al., 1995, figs.1–2 — p.1921.
Motile equivalent: Protoperidinium divaricatum (Meunier, 1919) Parke and Dodge, 1976, according to Matsuoka (1984b, p.2) — however, see Head (1996b, p.1213).
Stratum typicum: Recent
Locus typicus: Dee Estuary, North Sea, England
----------------------------------------------------------------------------------------------------------------------------------
Original description: Reid, 1977, p. 447-448
Diagnosis: A species of Xandarodinium with a concave ventral area and convex dorsal area. Wall thin with a smooth surface. Processes have elliptical circular or elongate bases in plan view; from as extensions from the wall, and are terminated by simple spines or multifurcate extensions. Ventral surface and anterior dorsal surface, smooth and not ornamented by processes.
Dimensions: Holotype, test 56x56 µm, process height 6 µm. Range, test, 46x46-48x63 µm, process height, 5-19 µm. 15 specimens measured.
Description (annotated): The processes ornamenting the cyst may be simple, circular or complex flanges with multifurcate tips. Dorsal processes are intratabular, aligned equatorially reflecting the cingulum and intercalary plates. A small process complex is found at the anterior end of the ventral area and the apical plates are reflected by three processes. A complex of processes is found on two low antapical bosses with a shallow depression connecting them. Processes are not found on the operculum of the archeopyle. The cyst has a characteristical pale yellow-brown colour and was seen in certain specimens to contain a thin hyaline layer.
Affinities:
Reid, 1977, p. 447
This species is similar to the illustration of the cyst of Protoperidinium minutum (Kofoid) Loeblich by Wall and Dale (1968). It differs in having a smooth and not corrugated surface, and in not being spherical.